HEIDENHAIN ND 221B Bedienungsanleitung

English (en)

12/2001

Measured Value Displays

User’s Manual

ND 221

SALES & SERVICE:

A Tech Authority, Inc.

13745 Stockton Ave.

Chino CA 91710

909-614-4522

[email protected]

Numeric keypad

with decimal point

Status display with indicators

Display of actual value and input

(9 decades with algebraic sign)

HEIDENHAIN

789

456

123

0.CL

MOD

REF SET START PRINT inch

MIN ACTL MAX DIFF

Indicator Meaning

REF If the decimal point is also blinking:

Display is waiting for reference mark

traversing.

If decimal point is not blinking:

Reference mark has been traversed—

display stores datum points in nonvolatile

memory.

Blinking: display is waiting for ENT or

CL to be depressed.

inch Position values in inches

1 / 2 Selected datum point

PRINT Measured value output with MOD key

SET Blinking: Display is waiting for input

values

MOD

Key Function

• Set datum

• Transfer input value

• Set display to value from P79 (P80!)

• Leave parameter list

• Select datum

• Page backwards in parameter list

• Select parameter after switch-on

• Page forward in parameter list

• Start measured value output “PRINT”

• Delete entry

• Set display to zero (P80!)

• CL plus MOD: select parameter list

• CL plus number: select parameter

• Delete parameter input and show

parameter number

• Algebraic sign

• Reduce parameter value

• Decimal point

• Increase parameter value

< / = / > Without function

MIN

MAX /

DIFF / ACTL /

START

This manual is for the ND 221 B measured value

display with the following software number or

higher:

349 797-04

The software number is indicated on a label on

the rear panel.

Items supplied

Items supplied with ND 221 B

Measured value display unit,

ND 221 B benchtop model

Encoder input 11 µAPP Id. Nr. 344 992-xx

Power cord 3 m (9.9 ft)

User's Manual ND 221 B

Adhesive plug-in feet For stacking ND 221B units

Installation and Specifications

Rear Panel, Accessories 11

Mounting 12

Power Connection 13

Operating Parameters 14

List of Operating Parameters 16

Linear Encoders 19

NonlinearAxis Error Compensation 22

Locking the Keypad 26

Displaying the Software Version 27

Distance-to-Go Mode 28

RS-232-C/V.24 Interface (X31) 29

Input and Output of Parameter and 32

CompensationValue Lists

Output Format of the Parameter List 34

Output Format of the CompensationValueTable 37

Remote Operation over the RS-232-C/V.24 40

Data Interface

Specifications 43

Dimensions 44

Contents

Working with the ND Display Units

Position Encoders and Reference Marks 6

Switch-On, Traversing Reference Marks 7

Datum Setting 8

MeasuredValue Output 9

Error Messages 10

Scale in Distance-coded

linear encoder reference marks

Position Encoders and Reference Marks

The ND 221 B display unit is designed for use with

photoelectrical linear encoders with 11 µApp sinusoidal

signals: primarily for HEIDENHAIN MT length gauges with

11 µApp.

The MT length gauges have one reference mark. The scales

of other photoelectric linear encoders (see "Linear Encoders")

can contain one reference mark or many

distance-coded

reference marks.

If there is an interruption of power, the relationship between

the position of the length gauge and the displayed position

value is lost. The reference marks on the position encoders

and the REF reference mark evaluation feature enable the

display unit to quickly reestablish this relationship again

when the power is restored.

When a reference mark is crossed over, a signal is generated

which identifies that position as a reference point. At the

same time, the display unit restores the relationship

between length gauge position and display values which you

last defined by setting the datum.

To restore the datum on scales with distance-coded

reference marks, you only need to traverse a maximum of

20 mm (signal period: 20 µm).

Reference mark

Reference marks on linear encoders

Position Encoders and Reference Marks

Switch-On, Traversing the Reference Marks REF Mode

Crossing over the reference marks automatically switches

the display to REF mode: The last assignment of display

values to length gauge positions is stored in nonvolatile

memory.

1) Press the CL key if you choose not to traverse the

reference marks. Note that, in this case, the relationship

between length gauge position and display value will be

lost if the power is interrupted or if the unit is switched off.

Turn on the power.

(Switch located on rear panel.)

• ND 221 B appears for two seconds.

•ENT...CL 1) appears.

• REF indicator is blinking.

Switch-on the reference mark

evaluation function.

• The position value that was last

assigned to the reference mark

position is displayed.

• REF indicator lights up.

• Decimal point is blinking.

Cross over the reference mark.

Move the plunger until the display starts

counting and the decimal point stops

blinking. The display is now ready for

operation.

5,697

ENT...CL

For automation purposes, crossing over the reference marks

and the display ENT ... CL can be disabled with parameter

P82.

Switch-On, Traversing the Reference Marks

Datum Setting

The datum setting procedure assigns a display value to a

known position. With the ND 200 series, you can set two

separate datum points.

There are several ways to set the datum:

• Enter a numerical value, or

• Transfer a value from an operating parameter

(see P79, P80).

Select datum 1 or 2.

After datum setting: assignment of measured values to positions

Without datum setting: unknown assignment of measured values

to positions

Enter numerical value (here, 5).

Datum Setting

Confirm the entered numerical value.

You can switch between datums 1 and 2 as desired. Datum 2

can be used, for example, for working with incremental

dimensions.

When you switch back to datum 1, the display unit resumes

display of the encoder's actual position.

Measured Value Output

For technical information on the RS-232-C/V.24

data interface (X31), information on the data

format, etc., see the chapter “RS-232-C/V.24

Interface (X31).”

Measured values can be output over the RS-232-C/V.24

interface (X31), for example to a printer or PC.

There are several ways to start measured value output:

Press the MOD key (check the parameter settings for P86).

Input the command STX (Ctrl B) over the RXD input of the

RS-232-C/V.24 interface (X31).

HEIDENHAIN

REF

1 SET

START PRINT

in.

MIN ACTL MAX DIFF

789

456

123

0.–CL

MOD

Measured Value Output

The RS-232-C/V.24 interface (X31) enables you to connect a printer

or a PC to your display unit

Other error displays

If “OVERFLOW” appears, the measured value is too large or

too small:

Set a new datum.

Traverse back.

To clear error messages:

Once you have removed the cause of the error:

Clear the error message with the CL key.

Error Messages

Display Effect/Cause

RS232 FAST Command for measured value

output followed too quickly by

another. 1)

SIGNAL Encoder signal is too weak.

The scale may be contaminated. 1)

DSR.MISSING The connected device has not

sent a DSR signal. 1)

REF. ERR. The spacing of the reference

marks as defined in P43 is not the

actual spacing. 1)

FORMAT ERR. Data format, baud rate, etc. do not

match. 1)

FREQUENCY Input frequency too high for

encoder input. Traversing speed

may be too fast. 1)

MEMORY ERR. Checksum error: Check the datum,

operating parameters and com-

pensation values for nonlinear axis

error compensation. If this error

recurs, contact your service

agency!

1) These errors are important for the attached device.

Display Effect/Cause

REC. PARAM. Error during reception of parameter

and compensation value lists

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